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Add 16/21 and 9/28

16/21 + 9/28 is 13/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 28 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    16/21 = 16 × 4/21 × 4 = 64/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    9/28 = 9 × 3/28 × 3 = 27/84
  4. Add the two like fractions:
    64/84 + 27/84 = 64 + 27/84 = 91/84
  5. 91/84 simplified gives 13/12
  6. So, 16/21 + 9/28 = 13/12
    In mixed form: 11/12

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